I have used a 1:1 mix of Hydrogen peroxide and white vinegar. This was suggested to me by a fellow shooter. It works very well to remove lead and copper that a phosphor bore brush alone cant.
Remove your barrel and plug on end. I use electrical tape wrapped around a robertson screw driver. Others have suggested a soft foam ear plug.
Make the mixture fresh ( you will need about 5-10 mls of it, i use one of those measuring cups from a medicine bottle) and pour it into the barrel right to the top of the breach and let it work for 7 to 10 min. Do not let it go too long... It may pit your barrel if you leave it an hour or longer.. It should bubble and will turn black to some degree.
Then wash with water filling the barrel a few times to dilute the cleaner. Then use a phosphor bore brush with G96 or some other cleaner. My bore is alway shiney like new. Hope this works for you.
RDG
Remove your barrel and plug on end. I use electrical tape wrapped around a robertson screw driver. Others have suggested a soft foam ear plug.
Make the mixture fresh ( you will need about 5-10 mls of it, i use one of those measuring cups from a medicine bottle) and pour it into the barrel right to the top of the breach and let it work for 7 to 10 min. Do not let it go too long... It may pit your barrel if you leave it an hour or longer.. It should bubble and will turn black to some degree.
Then wash with water filling the barrel a few times to dilute the cleaner. Then use a phosphor bore brush with G96 or some other cleaner. My bore is alway shiney like new. Hope this works for you.
RDG
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